I am having trouble with some Intro to Probability questions so I have decided to turn to mathhelpforum.com! :)

The questions are:

2. A coin is tossed three times. What is the probability of tossing at least one head?3. A standard die is rolled. What is the probability of rolling a prime number?4. Use a tree diagram to explain why the probability that a family with four children has either all girls or all boys is https://www.virtualhighschool.com/co...G8Y5s5yFPIfL7w, assuming that the probability of having a boy equals the probability of having a girl.5. If you were to toss four coins what are the odds in favour of 2 heads showing up.